《医疗废弃物管理条例》规定,医疗机构内的医疗废弃物暂时贮存时间不超过()
A.1天
B.2天
C.3天
D.4天
E.5天
参考答案:B
The young man acted strangely during the interview.He made a bad________on the employer.[ ]
A.impression
B.expression
C.experience
D.opinion
当x= -1时,代数式3x2 -4x -15的值是( )